Methyl and ethyl-n-{8 3-(3{40 -methylphenyl-carbamyloxy)-phenyl{9 carbamates

ABSTRACT

New phenyl carbamates are provided as herbicides, broadly effective against many types of weeds, particularly of the dicotyledenous type.

United States Patent Boroschewski et al. 1 Sept. 19, 1972 [54] METHYL AND ETHYL-N-[3-(3'- [51] Int. Cl. ..C07c 79/46, C07c 101/00 METHYLPHENYL-CARBAMYLOXY)- [58] Field of Search ..260/47l, 472 PHENYLICARBAMATES [72] inventors: Gerhard Borouhewski; Friedrich [56] References Cited A M R lnhart R h all of Berlin, z usc UNITED STATES PATENTS [73] Assignee: Schering A.G., Berlin and Be 3,404,975 10/1968 Wilson etal ..7l/ 100 kamen, Germany P E A] M l nmary xammerex aze Flled- Sept 1969 Assistant Examiner-Jose Tovar [211 App]. No.2 861,198 Attomey-Klein and Padlon and Joseph T. Padlon [30] Foreign Application Priority Data [57] ABS CT Apr. 9, 1965 Germany ..Sch 36854 R I MU s Dam New phenyl carbamates are provided as herbicides, e a pp broadly effective against many types of weeds, par- [63] Continuation of Ser. No. 536,283, March 22, ticularly of the dicotyledenous type.

1966, abandoned.

2 Claims, No Drawings [52] US. Cl. ..260/472, 260/247.2 B, 260/3263,

METHYL AND ETHYL-N-[3-(3 '-METHYLPHENYL- CARBAMYLOXY)-PI-IENYL]CARBAMATES This application is a streamlined continuation of Ser. No. 536,283, filed-Mar. 22, 1966, now abandoned.

The invention relates to herbicidal agents. More, particularly it refers to agents containing new, substituted phenyl carbamates.

In the field of herbicides, the action of phenyl carbamates, e.g., isopropyl-N-phenyl carbamate and isopropyl-N-(3-chlorophenyl) carbamate, is already known. However, these agents do not show a sufficiently broad efiect. Important field weeds, such as groundsel, chamomile, and frenchweed, etc., are not controlled, or only unsatisfactorily so by such agents.

In accordance withthe present invention, it has now been found that agents containing at least one compound of the general formula:

wherein R represents alkyl, cycloalkyl, aryl possibly substituted by halogen and/or alkyl and/or trifluoromethyl; R represents hydrogen or alkyl, R, and R together with the N atom, a heterocyclic ring possibly containing additional N and/or atoms, and R represents alkyl, alkenyl, or alkinyl possibly substituted by halogen, in the end position; are broadly effective against a plurality of weeds, particularly also the dicotyledonous types of plants.

It is an object therefore, of the present invention to provide agents containing at least one compound of the foregoing general formula for effective action on undesirable plants.

The herbicidal effect of the compounds above generally indicated extends to their application both in pregermination and in postgermination treatment of plants and therefore, permits the use of the agents containing these compounds according to the desired type of application. Another advantage is the effectiveness in their contact treatment over or on the leaves of established weeds.

It has further been found that some of the compounds, particularly methyl-3-(3-methylphenyl-carbamoyloxy)-phenyl-carbamate and ethyl-3-( phenylcarbamoyloxy)-phenyl-carbamate have a selective herbicidal effect and can be used, for example, for weed control in beet cultivation.

Compounds which can be used according to the invention are for example the following:

Ethyl-3'-( 2 -chl0 rophenyl-carbamoyloxy )-phenylcarbam ate Beta-chlorethyl-3-( 2 -chlorophenyl-carbamoyloxy)- phenyl-carbamate M ethyl-3 3 -chlorophenyl carbamoyloxy)-phenylcarbamate Ethyl-3-( 3 -chlorophenyl-carbamoyloxy )-phenylcarbam ate Methyl-3-( 4 -chlorophenyl-carbamoyloxy )-phenylcarbam ate Ethyl-3-( 4 -chlorophenyl-carbamoyloxy )-phenylcarbam ate 5 Compound n-Propyl-3-(4'-chlorophenyl-carbamoyloxy)-phenylcarbamate n-Butyl-3-(4-chlorophenyl-carbamoyloxy ).-phenylwb m Melting Point Ill Methyl-3-( 2-methylphenylcarbamoyloxy )-phenylcarbaniate Ethyl-3-(2'-methylphenylcarbamoyloxy )-phenylcarbamate Betachlorethyl-3-( 2- methylphenyl-carbarnoyloxy phenyl-carbamate l-Butin-3-yl-3 -(3 -methylphenylcarbamoyloxy)-pheny-carbamate l-Butin-3-yl-3-( 4-methylphenylcarbamoyloxy )-phenylcarbamate l-Butin-3-yl-3-( 3- trifluorom ethylphenylcarbamoyloxy )-phenyl carbamate 129-1 30C Ethyl-3-(diethylearbamoyloxy)- phenyl-carbamate Ethyl-S-pentamethylencarbamoyloxy )-phenylcarbamate Ethyl-3-methyl-carbamoyloxy phenyl-carbamate carbamate Beta-Chlorethyl-3- methylcarbamoyloxy )-phenylcarbamate n-Propyl-3-methylcarbamoyloxy)- phenyl-carbamate n-Butyl-3-methylcarbamoyloxy phenylcarbam ate Methyl-CHn-butylcarbamoyloxy phenyl-carbamate Ethyl-1H n-butylcarbamoyloxy)- phenyl-carbamate sec.-Butyl-3-(nbutylcarbamoyloxy )-phenylcarbamate Methyl-3- (cyclohexylcarbamoyloxy)- phenyl-carbamate Ethyl-3- (cyclohexylcarbamoyloxy)- phenyl-carbamate Beta-Chlorethyl-3-( cyclohexycarbamoyloxy )-phenylcarbamate n-Propyl-3- (cyclohexylcarbamoyloxy phenyl-carbamate n-Butyl-3- (cylcohexylcarbamoyloxy phenyl-carbamate Ethyl-3-( 3 -methylphenylcarbamoyloxy )-phenylcarbamate Beta-Chl0rethyl-3-( 3 methylphenylcarbamoyloxyloyl )-phenylcarbamate Methyl-3-(4 -methylphenylcarbamoyloxy )-phenylcarbarnate Ethyl-1H4-methylphenylcarbamoyloxy )-phenylcarbamate Ethyl-3-( 3-trifluormethylphenylcarbamoyloxy )-phenylcarbamate Beta-Chlorethyl-3-( 3 trifluorrnethylphenylcarbamoyloxy)phenyl-carbamate l-Butin-3-yl-(3- methylcarbamoyloxy )-phenylcarbarnate l-Butin-3-yl-( 3 cyclohexylcarbamoyloxy phenyl-carbamate phenylcarbamoyloxy)-phenylcarbamate l3l-l32C l27-l28C Ill-112C ll4-l 15C carbamate 5 EXAMPLE 2 Ethyl-3-(pentamethylen-carbamoyloxy)+phenyl-carbamate carbamate.

14.5g(0.08 mole) of ethyl-N-(3-hydroxyphenyl) carbamate are dissolved in 30 ml of dry pyridine and the solution mixed with 13.1 g (0.088 mole) of piperidine- N-carboxylic-acid chloride. After two hours at room temperaturethe product is heated on the steam bath for 90 minutes. Then the pyridine is evaporated under vacuum and the residue is taken up in ether and dilute sodalye with addition of ice. The ether solution is washed successively with water, dilute hydrochloric acid, water, and dilute KHCO solution, the temperature being maintained at C. by the addition of ice. After drying with sodium sulfate and extensive evaporation of the ether, the carbamate crystallizes upon addition of petroleum ether.

Yield: 15.8 g 68% of the theoretical amount M.p.=103.5 to l05.5 C.

Analysis for c,,H,,,N,o,

Calculated: ,C 61.65% H 6.90% N 9.59%

,Found: C 61.18% H 7.00% N 9.56%

The new phenyl carbamates are slightly soluble or insoluble in water, benzene and gasoline, and moderately or easily soluble in acetone, isophorone, dimethylformamide, and dimethyl sulfoxide.

The N-hydroxy-phenyl urethanes needed as starting products for theirproduction, some of which are not as yet described in the literature, can be obtained in. a manner known in .itself, e.g., by N-acylation of maminophenol with the corresponding chloroformic acid esters, e.g., in a mixture of acetic ester and water with addition of magnesium oxide.

The production of one of the starting products is hereby described.

21.8 g (0.2 mole) of m-aminophenol and g of magnesium oxide are taken up in 70 ml of water and 70 ml of acetic ester. While cooling to to C., one then adds drop by drop 26.5 g (0.2 mole) of chloroformic acid butin-(1)-yl-(3) ester with agitation, continuing to agitate for 30 minutes at room temperature. The excess magnesium oxide is then dissolved in dilute hydrochloric acid and the organic phase is washed neutral with small amounts of water and subsequently with dilute potassium bicarbonate solution. After drying with sodium sulfate and evaporation of the acetic ester under vacuum, the crude product is purified by dissolving in small quantity of ether, filtering of the ether solution, and then crystallizing the butin-(1)-yl-(3)-N-(3- hydroxyphenyl) carbamate by the addition of light gasoline.

Yield: 34 g 83% of the theoretical amount M.p. 94 to 95 C. Analysis for C H NO Calculated: C 64.38% H 5.40% N 6i83% Found: C 64.23% H 5.59% N 6.90%

By the same process the other N-hydroxyphenylurethanes required as starting products can also be produced. some of which are listed in the following table:

lsopropyl-n-(3-hydroxyphenyl) carbamate -76 deg. C n-Butyl-N-( 3-hydroxyphenyl) carbamate 87-88 deg-C sec.-Butyl-N-(3-hydroxyphenyl) 1 15-1 16.5 deg. C carbamate Beta-chloroethyl-N-( 3-hydroxyphenyl) carbamate 87.5 deg. C

The new phenyl carbamates can be used alone or as mixtures with each other and/or with other herbicides and/or other materials, such as fertilizers, for weed control.

Their application is advantageously effected in a manner customary for weed control in the form of preparations, such as .powders, granulates, solutions emulsions or suspensions, with the addition of liquid and/or solid vehicles or diluents and possibly wetting, adhesion, emulsifying and/or dispersing aids.

The various preparations occur in any one or more of the forms customary for plant protectants with the use of liquid or solid inert vehicles or diluents and possibly the addition of surfaceactive substances.

As suitable liquid vehicles the organic solvents, such as isophorone, Decalin, tetralin, dimethylformamide and dimethyl sulfoxide, etc. have been used.

As solid vehicles there enter into consideration, for example, lime, kaolin, talcum, natural or synthetic silicic acid, Atta clay and other clays.

Surface-active substances found suitable with the herein described agents are, for example, salts of lignin sulfonic acid, salts of alkylated benzene sulfonic acids, sulfonated acid amides and their salts, polyglycols, polyethoxylated amines, alcohols, and phenols.

For selective weed control, quantities of about 0.3 kg of active ingredient per hectare have in part proved sufficient. The herbicidal action of the agents according to the invention is evident from the following test examples.

EXAMPLE 3 In the greenhouse, the compounds listed in the following table were sprayed on mustard and tomatoes as test plants in a quantity of 10 kg of active ingredient per hectare, suspended in 800 liters of water per hectare. In contrast to isopropylN-phenyl carbamate as control, destruction of the test plants was achieved.

Compound No. Mustard Tomatoes 1 0 l 2 O 1 3 O 0 4 0 0 5 0 5 6 O l 7 O 7 8 0 7 9 0 0 10 l 9 1 1 0 3 l2 0 2 13 0 1 l4 0 1 15 0 0 16 0 0 17 0 0 l8 1 7 l9 0 1 2O 0 0 21 0 l 22 0 O 23 0 6 24 0 O 25 0 0 26 1 l 27 0 5 28 O 7 29 0 0 3? g i I EXAMPLE 4 3% 8 8 In the greenhouse, with purpose of killing weed while 34 1 in the cotyledon stage of crops and weeds, the com- ;g A 8 pounds listed in the table were sprayed in a quantity of 37 o 1 1 kg of active ingredient per hectare, suspended in 800 33 8 liters of water per hectare, on the following plant spe- 40 o 0 cies. As can be noticed from the results, the control 41 1 4 isopropyl-N-(3-chlorophenyl)-carbamate has only a 1g 8 3 l0 slight effect compared with the agents according to the 44 o l invention.

Sugar Nina air Bolmmm Vm'iunclln Slellaria llalinsoga Senecio Matricaria Compound No. lvus bouts (Inn'ots Unions (true/[six ssp. ssp. media parviflora vulgaris chamomz'lla V i m 111 10 2 0 4 4 1 5 m 10 10 m o 0 o 1 2 0 1 ll) l0 l0 10 l 10 1 4 2 3 1 I!) 0 l0 10 l l U 0 0 0 0 ll] 5 7 l0 ll 1 0 U 0 0 i) 10 l 7 ll] U -l 0 0 0 O 0 l0 7 7 ll) ll 3 (l O 0 I 0 10 U lll lU U (l 0 0 l) U 0 1o 10 10 1o 0 5 0 1 o 2 2 w m 111 m u 7 0 u 0 5 10 1o 10 10 10 u 11 o 0 o 0 0 10 ll) 10 ll] (1 4 O U 0 0 O 8 I. 8 10 ll 1 0 U l 2 0 1n 2 10 10 n 0 0 o o 4 0 1U 10 ll) 10 (l 10 0 U .2 (i 3 lo p11QnyD-curImnmte. 7 Ill 10 I 10 5 10 10 7 10 10 10 NOTE. ll=complct0ly destroyed. lll=no vliovt,

45 0 EXAMPLE 5 46 0 2 47 0 1 4s 0 1 0 2 In the reenhouse, b treatment the cm s and weeds, 50 0 0 g P 51 1 0 before their germlnanon, the listed compounds were 2% 8 sprayed in a quantity of 0.3 kg of active ingredient per 54 1 1 hectare, suspended in 800 liters of water per hectare, 55 O 0 on bare sandy soil. The results evidence the better ef- 56 2 4 0 1 feet of the agents of the invention on stubborn weed is 3 species, such as, frenchweed (Gali'nsoga parviflora), 6O 0 O groundsel (Senecio vulgaris) and chamomile 0 0 (Matricaria chamomilla), which are not controllable 2% z 3 with the control isopropyl-N-(3-chlorophenyl)-carba- 64 1 0 mate.

Sugar Sinapis Solzmum Vzn'iunolla Slcllaria Galimoga Senecio Matricaria Compound No. Peas beets (:u'rots Onions anrmlsis $51). 35 media parviflora yulgaris chamomilla 2i r r l0 l0 1U 10 -l ll) 10 O 1 1 l 2 1O 0 10 l l) 0 0 0 0 0 0 25. l0 l0 l0 l0 0 (l U 0 U 0 O IsOpropy lilorplionyl)-carbnmutc l0 10 10 10 10 U 10 0 10 1O 10 NOTE.0 =completcly destroyed. 10=no ellcct.

65 0 l 66 3 3 EXAMPLE 6 e7 0 0 68 0 0 69 0 0 70 o 1 In the open field, crops and weeds in the 2-4 leaf 8 stage were sprayed with aqueous emulsions or suspen- 73 0 1 sions of the compounds listed in the following table in 7 g g quantities of 2 and 5 kg of active ingredient per hec- 76 0 1 tare. The crops treated were sugar beets and peas. The z; 8 8 growth of weeds consisted of the important annual field 79 0 0 weeds Sinapis ssp., Papaver ssp., Chenopodium album, I N h I 0 3 Spergula arvensis, Centaurea ssp., Senecio vulgaris, $12353; p my. 7 g Galinsoga parviflora and Lamin amplexicaule. As can 0 completely destroyed I0 no effect be seen from the table, the control isopropyl-N-(3- chlorophenyl) carbamate has only a weak postgermination effect without selectivity in comparison with the agents according to the invention.

Kg. Sugar Sinapix l'npuvi-r podium Sprryula (rullmrm Srurciv (Iulinmu/rl Imnium Compound N 0. hectare luns boots am-nsix sq). rzlh. urz'. ssp. pulg. purnijlnm ampl.

21 i 2 10 (l (l 0 (l (l (l l) (l --1 u o u 0 o n 0 0 0 a4 .2 l0 0 U (I 0 U (I (l U 0 5 10 u o 0 0 0 0 0 0 o 2 2 ll) 0 0 0 0 0 U 0 0 0 5 5 10 o 0 0 o 0 o u 0 0 43 2 10 10 0 0 0 0 0 0 U 0 5 1 1o 0 0 0 0 0 0 0 0 50 2 10 10 0 0 0 0 0 0 0 0 5 1 10 0 0 0 0 0 0 0 0 Isopropyl-N-(3-ch1orphe11- 7 10 U q 6 10 10 10 10 YVcarbamflte 5 7 a s 6 3 10 10 10 10 No'rE.-10=not damaged. 0=completely destroyed.

EXAMPLE 7 The following is an example illustrating an emulsion concentrate in which the components were mixed together preferably in the order given.

20 by weight of one of the new phenyl carbamates l5 by weight of emulsifier on a base of polyglycol 45 by weight of isophorone l5 by weight of tetralin 5 by weight of dimethyl sulfoxide EXAMPLE 8 A dispersible wettable powder was made by mixing the following listed components together with the aid of an air jet mill:

50% by weight of one of the new phenyl carbamates by weight of calcium lignin sulfonate 35% by weight of talcum We claim: 1. Methyl-3-(3'-methylphenyl-carbamoyloxy-phenylcarbamate.

2. Ethyl-3-(3'-methylphenyl-carbamoyloxy)-phenylcarbamate. 

2. Ethyl-3-(3''-methylphenyl-carbamoyloxy)-phenylcarbamate. 